海上风电场风机桩基局部冲刷计算

Calculation of local scour around wind turbine′s pile of offshore wind farm

建设海上风电场时,风机所处的海洋环境十分复杂,在风、浪、流等气象水文要素的影响下,风机桩基周围会出现冲刷坑,进而影响风机基础的稳定。因此,风机桩基的局部冲刷深度是工程设计的重要参数。采用埕岛油田海洋平台桩基局部冲刷现场观测资料,对国内常用的2个计算桩基局部冲刷深度的经验公式(韩海骞公式和王汝凯公式)进行验证,运用波流合成速度代替纯潮流速度。结果表明该海域波浪对泥沙的作用不可忽略。韩海骞公式重新计算的结果与实测值吻合良好。

When building the offshore wind farm,the marine environment of wind turbine is very complex.Scour hole around wind turbine′s pile will form because of the influence of meteorology and hydrology factors,such as wind,wave,current,and so on.It will affect the stability of wind turbine.Therefore,the local scour depth of wind turbine is an important parameter for engineering design.Based on the field observation data of the piles in Chengdao oil field,two commonly used empirical formulas（HAN Hai-qian and WANG Ru-kai） were verified.The synthesis speed of wave and current was used to replace the pure tidal current speed.The results show that the role of wave on sand can not be ignored in this area.The re-calculated result by HAN Hai-qian formula is in good agreement with measured result,and the results have some reference value to the actual project.